In stock

Wiseco Piston Kit — 66.40 mm — Yamaha YZ250/YZ250X

Wiseco · #804M06640 · Bottom End / Engine

Designed for all-purpose 2-stroke riding
Durability, longevity and increased horsepower
Dedicated forging design for strength-to-weight optimization
Extra lightening operations for enhanced throttle response
Engineered, forged, and machined in the USA

$171.95

In stock. Ships in 2–4 business days · free shipping over $150.

Questions? Call the shop: 801-361-3010

Real shop · real humans · 1231 N 1300 W Ste A, Centerville, UT 84014

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Description & features6 features

Kit Includes:

• 1x Piston

• 1x Ring Set #2614CD

• 1x Wrist Pin #S508

• 2x Circlips #CW18

Designed for all-purpose 2-stroke riding
Durability, longevity and increased horsepower
Dedicated forging design for strength-to-weight optimization
Extra lightening operations for enhanced throttle response
Engineered, forged, and machined in the USA
Piston is made in the USA

Specifications13 specs

Displacement: 249 cc
Model: Pro-Lite
Bore Size: 66.40 mm
Piston Material: 4032 Aluminum Alloy, Forged
Skirt Coating: Non-Coated
Stroke Length: 72.00 mm
Units: Kit
Bore - Oversize: Standard
Riding Style: Off-Road
Engine Type: 2-Stroke
Shipping weight: 0.65 lb
Package size: 4 × 3.9 × 3.5 in
Country of origin: USA

Fitment4 models · Yamaha

Yamaha4 models

YZ 250 Monster Energy Racing2024
YZ2501999–2026
YZ250 Monster Energy Yamaha Racing Edition2022–2023, 2025
YZ250X2016–2026

Fitment comes from the catalog data for this part. Double-check your year, model and trim before you order — or call the counter at 801-361-3010 and we’ll check it with you.

Part numbers

Salto part #: 804M06640
Wiseco part #: 804M06640

Shipping

In stock. Ships in 2–4 business days by ground.

Ground shipping is $14.95, free on orders over $150. Stock is checked again before your card is charged.

Questions4 answers

Is it in stock?: Yes — it’s in stock right now. We check again the moment you order, before anything is charged.
How fast will it get to me?: Usually 2–4 business days by ground.
Will it fit my machine?: It’s listed for the models in the Fitment section above. Not sure about your trim or year? Call the counter at 801-361-3010 and we’ll check it with you.
Is this genuine Wiseco?: Yes. It’s new and genuine, straight from Salto — Wiseco part #804M06640.